Fix issue with resetting terminal.

Ensure new BufferSet is used and clear selection manager on reset.

src/SelectionManager.ts

@@ -121,6 +121,10 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
     this._mouseUpListener = event => this._onMouseUp(<MouseEvent>event);
     this._trimListener = (amount: number) => this._onTrim(amount);
 
+    this.initBuffersListeners();
+  }
+
+  public initBuffersListeners(): void {
     this._terminal.buffer.lines.on('trim', this._trimListener);
     this._terminal.buffers.on('activate', e => this._onBufferActivate(e));
   }

src/Terminal.ts

@@ -292,6 +292,10 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
 
     // Create the terminal's buffers and set the current buffer
     this.buffers = new BufferSet(this);
+    if (this.selectionManager) {
+        this.selectionManager.clearSelection();
+        this.selectionManager.initBuffersListeners();
+    }
   }
 
   /**
@@ -2076,11 +2080,9 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     this.options.cols = this.cols;
     const customKeyEventHandler = this.customKeyEventHandler;
     const inputHandler = this.inputHandler;
-    const buffers = this.buffers;
     this.setup();
     this.customKeyEventHandler = customKeyEventHandler;
     this.inputHandler = inputHandler;
-    this.buffers = buffers;
     this.refresh(0, this.rows - 1);
     this.viewport.syncScrollArea();
   }